1933 ] 
New Genus of Phoridx from Peru 
109 
ning parallel to the axis of the wing. Beyond this greatly 
thickened oval structure is another slight thickening in the 
wing, indicated principally by its darker color as shown in 
the photograph; this is not perceptibly elevated above the 
wing surface on either side, and is distinctly separated from 
the strongly thickened area. 
Phymatopterella, gen. nov. (Figs. 1 and 2) 
Front bristled, as in Megaselia ; four post-antennal 
bristles, one pair of upwardly and inwardly directed antial 
bristles; lower frontal row of only the two lateral bristles, 
upper row of four, and four ocellar bristles. Costal vein 
long, with short setulae ; first vein entering the costa at its 
middle, third vein simple, not forked; four light veins: 
membrane of wing below the tip of the first vein with a 
large, dark, oval, thickened button-like thickening between 
the third and fifth veins; mediastinal vein not developed; 
antennae small, oval, with dorsal arista. Mesopleura bare. 
Middle and hind tibiae each with a double row of strong 
bristles. 
In general structure and habitus this genus is similar to 
Megaselia and Phalacrotophora, but the third vein is en- 
tirely without fork at apex. The chitinous thickening on 
the wing membrane is, so far as I know, absolutely unique 
in the family Phoridae. In Schmitz’s key to genera (Re- 
vision der Phoriden, p. 87) it will run in the neighborhood 
of Parametopina Borgmeier or Syneura Brues to which it is 
obviously not related. On this account it seems necessary 
to propose a new generic name. 
Phymatopterella shannoni, sp. nov. 
$ . Length 1.9 mm. ; wing 2.2 mm. Front and thorax 
above pale brownish yellow, the disc of the mesonotum 
darker; abdomen piceous with the posterior edges of the 
tergites whitish, more broadly so on the fifth and sixth 
segments ; the fourth and fifth tergites each with a pair of 
lateral yellowish spots ; coxae and legs brownish yellow, the 
four hind femora much darker; pleurae and venter black. 
Wings tinged with yellow ; t heavy veins dark, the costa 
